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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>实例：jQuery弹性滑动导航菜单</title>
<style type="text/css">
body{ font-size:100%; font-family:"Microsoft YaHei","Arial"; background:#fff;}
#nav{ position:relative; width:832px; _width:835px; margin:100px auto 0 auto; border-bottom:2px #ddd solid;}
#nav .nav-menu{ height:50px;}
#nav .nav-menu a{ display:block; float:left; height:50px; padding:0 40px; line-height:50px; color:#666; font-size:16px; text-decoration:none;}
#nav .nav-current{ position:absolute; bottom:-2px; height:2px; overflow:hidden; background:#80b600;}
</style>
<script type="text/javascript" class="library" src="js/jq/1.8/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
$(function(){(function(){
		var $navcur = $(".nav-current");
		var $nav = $("#nav");
		var current = ".current";
		var itemW = $nav.find(current).innerWidth();	//默认当前位置宽度
		var defLeftW = $nav.find(current).position().left;	//默认当前位置Left值
	
		//添加默认下划线
		$navcur.width(itemW);
	
		//hover事件
		$nav.find("a").hover(function(){
			var index = $(this).index();	//获取滑过元素索引值
			var leftW = $(this).position().left;	//获取滑过元素Left值
			var currentW = $nav.find("a").eq(index).innerWidth();	//获取滑过元素Width值
			$navcur.stop().animate({
				left: leftW,
				width: currentW
			},300);
			
		},function(){
			$navcur.stop().animate({
				left: defLeftW,
				width: itemW
			},300)
		})
	})();
});
</script>
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